If you're a limited company, you don't use the same self-assessment tax return system as other businesses. Instead, you pay corporation tax.
Unlike other types of business, you have to calculate the amount of tax you owe yourself.
This process is called 'corporation tax self-assessment' - but it uses completely different methods and deadlines to the self-assessment used by other types of businesses and self-employed people.
To work out how much tax you owe as a limited company, you fill out a company tax return.
Before we start getting into all this, it's well worth pointing out that trying to calculate your tax as a limited company can be very complicated, very challenging and very time-consuming. That's not to say it's not doable without a lot of time and perseverance - just that it's one of those areas where paying for an accountant is usually worth the money.
The company tax return or your accountant will take you through the following stages, but here's a quick run-down so you know what to expect.
You pay tax on your pre-tax profit, otherwise known as your taxable profits, which is the sum of:
Having added these, you then take off any relevant deductions, reliefs, losses or allowances.
You then apply the relevant tax rate to calculate your gross corporation tax payable. In the tax year 2008/09, these are:
You can then deduct any relevant tax credits, any income tax already deducted from interest income, and any corporation tax you've already paid (if you paid tax early, for example).
The accounting period for limited companies doesn't necessarily coincide with the tax year. It is, instead, your company's own accounting period, beginning and ending with the dates of your financial accounts as you submitted to Companies House.
As a limited company, your deadlines for filing your company tax return and paying what you owe also differ - unlike with other types of business.
For a fully comprehensive, insider explanation of all the terms HMRC uses, get it straight from the horse's mouth with its glossary of corporation tax.
What if my accounting period is shorter than 12 months?
Your corporation tax accounting period can be shorter than 12 months - just file one tax return covering that period.
What if it's longer than 12 months?
If your company accounts cover a period longer than 12 months, you have to split it into two corporation tax accounting periods and file two separate company tax returns - one for either period. The first accounting period will cover the first 12 months, the second will cover the rest of the time.
What happens with PAYE and NICs?
As you're a limited company, you have to operate a PAYE system and pay employees' National Insurance contributions (NICs). Find out more by reading these guides on *PAYE* and *NICs*.
How do I get taxed as an individual?
Because you've set up a limited company, you get taxed as an employee of that company - meaning income tax and NI contributions will be deducted from your salary using the PAYE system. If you earn ROI, dividends, benefits or loans from the company more than a certain amount, you may have to complete an income tax return as well - the standard self-assessment tax return. But this only applies over certain thresholds. Find out more here.
Do I need to pay tax on profits made outside the UK?
Providing your company is based in the UK, you still have to pay corporation tax on all taxable profits, regardless of what country they were made in.
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